Objective c UITableViewCell阴影上的动画不工作_Objective C_Uitableview_Core Animation

Objective c UITableViewCell阴影上的动画不工作

objective-c uitableview

Objective c UITableViewCell阴影上的动画不工作,objective-c,uitableview,core-animation,Objective C,Uitableview,Core Animation,我想在用户单击单元格时创建阴影动画效果，其中单元格的阴影将从0“增长”到预期半径下面是代码的快照，但我无法将其设置为动画： -(void) tableView:(UITableView *)tableView_ didSelectRowAtIndexPath:(NSIndexPath *)indexPath { UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath]; [CATransactio

我想在用户单击单元格时创建阴影动画效果，其中单元格的阴影将从0“增长”到预期半径

下面是代码的快照，但我无法将其设置为动画：

-(void) tableView:(UITableView *)tableView_ didSelectRowAtIndexPath:(NSIndexPath *)indexPath {

    UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];

    [CATransaction begin]; {
        [CATransaction setAnimationDuration:5];
        cell.layer.shadowOpacity = 1.0;
        cell.layer.shadowRadius = 20;
        cell.layer.shadowColor = [UIColor blackColor].CGColor;
        cell.layer.shadowOffset = CGSizeMake(0.0, 0.0);
    }
    [CATransaction commit];

    [tableView_ deselectRowAtIndexPath:indexPath animated:YES];
}

-(void) tableView:(UITableView *)tableView_ didSelectRowAtIndexPath:(NSIndexPath *)indexPath {

    UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];

    CABasicAnimation  *animShadow = [CABasicAnimation animationWithKeyPath:@"shadowRadius"];
    animShadow.fromValue = [NSNumber numberWithFloat:0.0];
    animShadow.toValue = [NSNumber numberWithFloat:20];
    animShadow.duration = 3.0;
    [cell.layer addAnimation:animShadow forKey:@"shadowRadius"];

    [tableView_ deselectRowAtIndexPath:indexPath animated:YES];
}

有什么建议吗？

例如，使用

CABasicAnimation

动画，要仅设置动画，

shadowOpacity

u可以尝试下面的代码

 -(void) tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
 {
    //animation  shadowOpacity
    UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
    CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"shadowOpacity"];
    animation.fromValue = [NSNumber numberWithFloat:0.0];
    animation.toValue = [NSNumber numberWithFloat:1.0];
    animation.duration = 1.0f;

    [cell.layer addAnimation:animation forKey:@"shadowOpacityAnimation"];
    [tableView deselectRowAtIndexPath:indexPath animated:YES];
    cell.layer.shadowOpacity = 1.0f;
    cell.layer.shadowRadius = 20.0f;
 }

-(void) tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
   //animation both the shadowOpacity and shadowRadius
   UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
   CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"shadowOpacity"];
   animation.fromValue = [NSNumber numberWithFloat:0.0];
   animation.toValue = [NSNumber numberWithFloat:1.0];

   CABasicAnimation *shadowRadiusAnimation = [CABasicAnimation animationWithKeyPath:@"shadowRadius" ];
   shadowRadiusAnimation.fromValue =[NSNumber numberWithFloat:0.0];
   shadowRadiusAnimation.toValue = [NSNumber numberWithFloat:20.0];

   CAAnimationGroup *group = [CAAnimationGroup animation];
   group.animations = @[animation,shadowRadiusAnimation];
   group.duration = 1.0f;

   [cell.layer addAnimation:group forKey:@"shadowGroupAnimation"];
   [tableView deselectRowAtIndexPath:indexPath animated:YES];
   cell.layer.shadowOpacity = 1.0f;
   cell.layer.shadowRadius = 20.0f;
}

-(void) tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
   //animation  shadowRadius
   UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];


  CABasicAnimation *shadowRadiusAnimation = [CABasicAnimation animationWithKeyPath:@"shadowRadius" ];
  shadowRadiusAnimation.fromValue =[NSNumber numberWithFloat:0.0];
  shadowRadiusAnimation.toValue = [NSNumber numberWithFloat:20.0];
shadowRadiusAnimation.duration = 1.0f;

  [cell.layer addAnimation:shadowRadiusAnimation forKey:@"shadowRadiusAnimation"];
  [tableView deselectRowAtIndexPath:indexPath animated:YES];
  cell.layer.shadowOpacity = 1.0f; //set final values
  cell.layer.shadowRadius = 20.0f;
}

要同时设置

shadowOpacity

和

shadowRadius

u的动画，可以使用下面的代码

 -(void) tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
 {
    //animation  shadowOpacity
    UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
    CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"shadowOpacity"];
    animation.fromValue = [NSNumber numberWithFloat:0.0];
    animation.toValue = [NSNumber numberWithFloat:1.0];
    animation.duration = 1.0f;

    [cell.layer addAnimation:animation forKey:@"shadowOpacityAnimation"];
    [tableView deselectRowAtIndexPath:indexPath animated:YES];
    cell.layer.shadowOpacity = 1.0f;
    cell.layer.shadowRadius = 20.0f;
 }

-(void) tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
   //animation both the shadowOpacity and shadowRadius
   UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
   CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"shadowOpacity"];
   animation.fromValue = [NSNumber numberWithFloat:0.0];
   animation.toValue = [NSNumber numberWithFloat:1.0];

   CABasicAnimation *shadowRadiusAnimation = [CABasicAnimation animationWithKeyPath:@"shadowRadius" ];
   shadowRadiusAnimation.fromValue =[NSNumber numberWithFloat:0.0];
   shadowRadiusAnimation.toValue = [NSNumber numberWithFloat:20.0];

   CAAnimationGroup *group = [CAAnimationGroup animation];
   group.animations = @[animation,shadowRadiusAnimation];
   group.duration = 1.0f;

   [cell.layer addAnimation:group forKey:@"shadowGroupAnimation"];
   [tableView deselectRowAtIndexPath:indexPath animated:YES];
   cell.layer.shadowOpacity = 1.0f;
   cell.layer.shadowRadius = 20.0f;
}

-(void) tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
   //animation  shadowRadius
   UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];


  CABasicAnimation *shadowRadiusAnimation = [CABasicAnimation animationWithKeyPath:@"shadowRadius" ];
  shadowRadiusAnimation.fromValue =[NSNumber numberWithFloat:0.0];
  shadowRadiusAnimation.toValue = [NSNumber numberWithFloat:20.0];
shadowRadiusAnimation.duration = 1.0f;

  [cell.layer addAnimation:shadowRadiusAnimation forKey:@"shadowRadiusAnimation"];
  [tableView deselectRowAtIndexPath:indexPath animated:YES];
  cell.layer.shadowOpacity = 1.0f; //set final values
  cell.layer.shadowRadius = 20.0f;
}

要仅设置阴影半径的动画，可以使用以下代码

 -(void) tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
 {
    //animation  shadowOpacity
    UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
    CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"shadowOpacity"];
    animation.fromValue = [NSNumber numberWithFloat:0.0];
    animation.toValue = [NSNumber numberWithFloat:1.0];
    animation.duration = 1.0f;

    [cell.layer addAnimation:animation forKey:@"shadowOpacityAnimation"];
    [tableView deselectRowAtIndexPath:indexPath animated:YES];
    cell.layer.shadowOpacity = 1.0f;
    cell.layer.shadowRadius = 20.0f;
 }

-(void) tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
   //animation both the shadowOpacity and shadowRadius
   UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
   CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"shadowOpacity"];
   animation.fromValue = [NSNumber numberWithFloat:0.0];
   animation.toValue = [NSNumber numberWithFloat:1.0];

   CABasicAnimation *shadowRadiusAnimation = [CABasicAnimation animationWithKeyPath:@"shadowRadius" ];
   shadowRadiusAnimation.fromValue =[NSNumber numberWithFloat:0.0];
   shadowRadiusAnimation.toValue = [NSNumber numberWithFloat:20.0];

   CAAnimationGroup *group = [CAAnimationGroup animation];
   group.animations = @[animation,shadowRadiusAnimation];
   group.duration = 1.0f;

   [cell.layer addAnimation:group forKey:@"shadowGroupAnimation"];
   [tableView deselectRowAtIndexPath:indexPath animated:YES];
   cell.layer.shadowOpacity = 1.0f;
   cell.layer.shadowRadius = 20.0f;
}

-(void) tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
   //animation  shadowRadius
   UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];


  CABasicAnimation *shadowRadiusAnimation = [CABasicAnimation animationWithKeyPath:@"shadowRadius" ];
  shadowRadiusAnimation.fromValue =[NSNumber numberWithFloat:0.0];
  shadowRadiusAnimation.toValue = [NSNumber numberWithFloat:20.0];
shadowRadiusAnimation.duration = 1.0f;

  [cell.layer addAnimation:shadowRadiusAnimation forKey:@"shadowRadiusAnimation"];
  [tableView deselectRowAtIndexPath:indexPath animated:YES];
  cell.layer.shadowOpacity = 1.0f; //set final values
  cell.layer.shadowRadius = 20.0f;
}

效果非常相似，没有太大区别

编辑完成动画后按视图控制器为此，u可以设置动画代理，并在动画完成后调用该代理

比如说,

-(void) tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
   //animation both the shadowOpacity and shadowRadius
   UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
   CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"shadowOpacity"];
   animation.fromValue = [NSNumber numberWithFloat:0.0];
   animation.toValue = [NSNumber numberWithFloat:1.0];

   CABasicAnimation *shadowRadiusAnimation = [CABasicAnimation animationWithKeyPath:@"shadowRadius" ];
   shadowRadiusAnimation.fromValue =[NSNumber numberWithFloat:0.0];
   shadowRadiusAnimation.toValue = [NSNumber numberWithFloat:20.0];

   CAAnimationGroup *group = [CAAnimationGroup animation];
   group.delegate = self; //this line set the delegate to self,
   //if u use other option's also u can set the delegate for 
   //"CABasicAnimation" also just set it to self and implement the
   // delegate method
   group.animations = @[animation,shadowRadiusAnimation];
   group.duration = 1.0f;
   [cell.layer addAnimation:group forKey:@"shadowGroupAnimation"];
   [tableView deselectRowAtIndexPath:indexPath animated:YES];
   cell.layer.shadowOpacity = 1.0f;
   cell.layer.shadowRadius = 20.0f; 
}


//implement the delegate method this is called when animation stops with the flag,

- (void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag
 {
   if(flag)
   {
     SecondViewController *controller = [[SecondViewController alloc] initWithNibName:@"SecondViewController" bundle:nil];
     [self.navigationController pushViewController:controller animated:YES];
  }
}

谢谢你的代码有效。我还发现了我的问题，因为在上面的代码之后，我有一个navigationController转换动画；通过添加这些，选定UITableViewCell时不会出现阴影动画。你能告诉我应该怎么做，这样我可以设置阴影的动画，然后再设置navigationController过渡动画吗？当我在最后一行中添加此内容时：[self.navigationController pushViewController:_newViewControllerAnimated:YES]；然后，我再也看不到阴影动画，屏幕将直接过渡到下一个ViewController。好的，在阴影动画完成后，您想按一下view controller吗？您好。如何在动画结束时删除Groupanimation